RHAGASTIS TRILINEATA Matsumura, 1921

Female Rhagastis trilineata. Photo: © NHMUK Male Rhagastis trilineata. Photo: © NHMUK

TAXONOMY

Rhagastis trilineata Matsumura, 1921, Thousand Insects Japan (Additam.) 4: 757. Type locality: "Formosa" [Japan].


ADULT DESCRIPTION AND VARIATION

Similar to Rhagastis mongoliana but immediately distinguishable by the almost uniform (not distinctly chequered) forewing fringes and the small black discal spot on the hindwing underside. Labial palp segment 2 longer than broad, not narrowed to base. Metanotum with a conspicuous tawny patch at each side.


Resting Rhagastis trilineata, Japan. Photo: © Kenichiro Nakao.

ADULT BIOLOGY


FLIGHT-TIME

Japan: 25.v-26.vii (Yakushima); 16.vi-4.ix (Honshu); 23.vii-10.viii (Kyushu).


EARLY STAGES

OVUM:

LARVA:

PUPA:

Larval hostplants. Hydrangea macrophylla (Nozaki & Miyata, 1989).


PARASITOIDS


LOCAL DISTRIBUTION

Japan: Honshu (Nashimoto; Shimohino; Tokyo; Bunkakaikan; Ena; Motosugan; Mikaboyama, 750m; Mt. Kitamuki; Shibata; Bushi; Ohara; Misakubomachi); Shikoku (Dono); Kyushu (Itzukimura; Taku); Yakushima (Aikodake).

The single record from Taiwan appears to be erroneous (Inoue, 1990).


GLOBAL DISTRIBUTION

Endemic to Japan.


Global distribution of Rhagastis trilineata. Map: © NHMUK.

BIOGEOGRAPHICAL AFFILIATION



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© A.R. Pittaway & I.J. Kitching (The Natural History Museum, London)